System and method for improving wireless data links

ABSTRACT

A system and method of improving data link performance between two or more wireless data transceivers includes: clipping and inverting the data components of a communication signal which are calculated to cause non-linear saturation effects in the downstream power amplifier; delaying a first time series to align the first time series with the clipped and inverted data components of a second time series; adding the clipped and inverted data components of the second time series to the delayed first time series to obtain a modified composite waveform; creating a sacrificial band containing principal energy of the clipped and inverted data components of the second time series; harvesting the principal energy of the sacrificial band to obtain an optimized composite waveform; and causing the composite waveform to produce non-linear distortion to optimize the harvested principal energy.

RELATED APPLICATIONS

This application claims priority to allowed U.S. Pat. No. 10,727,957titled “A SYSTEM AND METHOD FOR IMPROVING WIRELESS DATA LINKS” whichclaims priority to allowed U.S. Pat. No. 10,382,145 titled “A SYSTEM ANDMETHOD FOR IMPROVING WIRELESS DATA LINKS” filed on Jul. 13, 2018 whichclaims priority to U.S. Provisional Application Ser. No. 62/531,881titled “High Speed Data Sampling For Filtering, Recreating GPS Signals,and High Speed Communications” filed on Jul. 13, 2017 which are bothhereby incorporated by reference, in its entirety, for all it teachesand discloses.

FIELD OF THE INVENTION

The present invention discloses a sacrificial band linearization systemand method.

BACKGROUND

Amplifiers saturate causing power loss and data loss. The presentinvention solves the problem of amplifier saturation effects and powerrecycling associated with the excess, otherwise wasted, saturationenergy.

SUMMARY

A system and method of improving data link performance between two ormore wireless data transceivers includes: clipping and inverting thedata components of a communication signal which are calculated to causenon-linear saturation effects in the downstream power amplifier;delaying a first time series to align the first time series with theclipped and inverted data components of a second time series; adding theclipped and inverted data components of the second time series to thedelayed first time series to obtain a modified composite waveform;creating a sacrificial band containing principal energy of the clippedand inverted data components of the second time series; harvesting theprincipal energy of the sacrificial band to obtain an optimizedcomposite waveform; causing the composite waveform to produce non-lineardistortion to optimize the harvested principal energy; and amplifyingthe optimized composite waveform with the downstream power amplifier ofone or more of the two or more wireless data transceivers.

The at least one of the two or more waveforms may include encrypteddata. The encrypted data may be at least partially formed by arandomized process. The two or more waveforms may include identical datain different channels within the composite waveform. The method mayfurther comprise delaying the modified combined waveform before the stepof combining the sacrificial band to the modified composite waveform innon-overlapping signal space. The method the step of adding the clippedand inverted data components of the second time series to the delayedfirst time series to obtain a modified composite waveform, may modifythe composite waveform without knowing or changing any data containedwithin the two or more waveforms. The step of adding the clipped andinverted data components of the second time series to the delayed firsttime series to obtain a modified composite waveform, may modify thecomposite waveform without knowing or changing any encrypted datacontained within the two or more waveforms. Each of the two or morewaveforms of the optimized composite waveform may be equally amplifiedby the downstream power amplifier as a result of the optimized compositewaveform. The sacrificial band may be amplified by the downstreamamplifier without affecting the integrity of the optimized compositewaveform. The at least one of the two or more waveforms may beintentionally configured to cause the composite waveform to producenon-linear distortion to a non-compliant downstream amplifier. Acommunication device that improves data link performance between two ormore wireless data transceivers includes: one or more parallelprocessing blocks including non-transitory firmware configured to:combine two or more waveforms to produce a composite waveform; create afirst time series of the composite waveform in parallel to a second timeseries of the composite waveform; calculate data components of thesecond time series which will cause non-linear saturation effects whenamplified by a downstream power amplifier; clip and invert the datacomponents of the second time series which are calculated to causenon-linear saturation effects; delay the first time series to align thefirst time series with the clipped and inverted data components of thesecond time series; combine the clipped and inverted data components ofthe second time series to the delayed first time series to obtain amodified composite waveform; create a sacrificial band containingprincipal energy of the clipped and inverted data components of thesecond time series; combine the sacrificial band to the modifiedcomposite waveform in non-overlapping signal space to obtain anoptimized composite waveform; and the downstream power amplifier of oneor more of the two or more wireless data transceivers amplifying theoptimized composite waveform.

The at least one of the two or more waveforms may include encrypteddata. The encrypted data may be at least partially formed by arandomized process. All of the two or more waveforms may includeidentical data in different channels within the composite waveform. Thecommunication device may further comprise delaying the modified combinedwaveform before the step of combining the sacrificial band to themodified composite waveform in non-overlapping signal space. The step ofcombining the clipped and inverted data components of the second timeseries to the delayed first time series to obtain a modified compositewaveform, may modify the composite waveform without knowing or changingany data contained within the two or more waveforms. The step ofcombining the clipped and inverted data components of the second timeseries to the delayed first time series to obtain a modified compositewaveform, may modify the composite waveform without knowing or changingany encrypted data contained within the two or more waveforms. Each ofthe two or more waveforms of the optimized composite waveform may beequally amplified by the downstream power amplifier as a result of theoptimized composite waveform. The sacrificial band may be amplified bythe downstream amplifier without affecting the integrity of theoptimized composite waveform. The at least one of the two or morewaveforms may be intentionally configured to cause the compositewaveform to produce non-linear distortion to a non-compliant downstreamamplifier.

Sacrificial band linearization has the unique benefit that it is not apre-distortion algorithm; therefore, it is not burdened by Nth ordernon-linear memory effects. It is a feed forward technique wherein allsignal manipulations are performed in the DSP path prior to the DAC.Conceptually, we are monitoring the continuous sequence of I&Q complexsamples; however, we never actually dicker with that primary signalpath, but we do report when certain index samples exceed a threshold.Those samples that exceed the threshold will drive the Power-Amplifierinto non-linear compression, unless we can do something about it.

We desire to create a complementary inverse signal which would appearprecisely when needed to prevent the composite signal from passing thatthreshold, while not compromising our original waveform. Creating such asignal consists of 1) creating the perfect complement, then 2) capturingits odd order products by passing them through acceptably out-of-bandfilters—sacrificial filters.

BRIEF DESCRIPTION OF THE DRAWINGS

In order that the advantages of the invention will be readilyunderstood, a more particular description of the invention brieflydescribed above will be rendered by reference to specific embodimentsillustrated in the appended drawings. Understanding that these drawingsdepict only typical embodiments of the invention and are not thereforeto be considered limiting of its scope, the invention will be describedand explained with additional specificity and detail through use of theaccompanying drawings, in which:

FIG. 1 shows a functional block diagram in accordance with an embodimentof the invention;

FIG. 2 shows a clipped waveform and complimentary time series inaccordance with an embodiment of the invention; and

FIG. 3 shows a spectral band including a sacrificial band in accordancewith an embodiment of the invention.

DETAILED DESCRIPTION

It will be readily understood that the components of the presentinvention, as generally described and illustrated in the Figures herein,could be arranged and designed in a wide variety of differentconfigurations. Thus, the following more detailed description of theembodiments of the invention, as represented in the Figures, is notintended to limit the scope of the invention, as claimed, but is merelyrepresentative of certain examples of presently contemplated embodimentsin accordance with the invention. The presently described embodimentswill be best understood by reference to the drawings.

FIG. 1 shows a functional block diagram in accordance with an embodimentof the invention. Waveforms A, B, and C are combined into a compositewaveform creating a composite waveform which is likely to causesaturation effects in the downstream power amplifier (PA). Waveforms A,B, and C are often randomly encrypted signals with unknown magnitudesand unknown interactions. After the waveforms are combined they aresplit into a first time series and a second time series. The first timeseries is delayed by Z-m and the second time series is clipped by thethreshold clipper and inverted. The first time series is delayed by anequal delay caused by the threshold clipper and the inversion. Theclipped and inverted data components of the second time series are addedto the delayed first time series to obtain a modified compositewaveform. A sacrificial band, containing principal energy of the clippedand inverted data components of the second time series, is then createdand added to the modified composite waveform in an unusednon-overlapping signal space creating the sacrificial band. Theoptimized composite waveform is then amplified by the power amplifierwithout saturation effects. The sacrificial band energy can be harvestedand reused if desired.

FIG. 2 illustrates the combining of multiple independent waveformscausing saturated outlier spikes 202 (all spike above or below thedotted line), or the momentary power spikes 202. The spikes 202 causenon-linear saturation effects and severe distortions. However, a veryclever technique has been developed to cause excess bandwidth to besacrificed to remove these momentary outliers. FIG. 2 illustrates acommon time signal that would drive a PA into a non-linear distortionmode. The signals above and below the L-clip dashed lines areresponsible for the distortion. By reducing signal spikes before theyare presented to the power amplifier can be achieved by judiciousselection of “momentarily opposing dual” (MOD) signals. By allowingcertain sacrificial spectral bands to be utilized, we significantlyreduce the magnitude of the outliers. An inverted complimentary timeseries is shown (below) the primary waveform and is created from thethreshold level surpassing peaks (above and below the dotted lines). Wedesire a version of that time series (lower portion) that will reside innon-overlapping signal space creating the sacrificial band.

Sacrificial band linearization has the unique benefit that it is not apre-distortion algorithm. Techniques implemented to pre-distort signalsbefore they are compressed by the non-linear gain regions (compressionregions, P1dB) of a power amplifier work well to the point where thememory effects of the PA become too severe. The wider the bandwidth ofthe signals, the more severe the memory effects become.

FIG. 3, shows a version of the inverted time series of FIG. 2 innon-overlapping signal space creating the sacrificial band 302. Datalink waveforms 302 are able to be amplified without any distortion fromthe power amplifier.

The systems and methods disclosed herein may be embodied in otherspecific forms without departing from their spirit or essentialcharacteristics. The described embodiments are to be considered in allrespects only as illustrative and not restrictive. The scope of theinvention is, therefore, indicated by the appended claims rather than bythe foregoing description. All changes which come within the meaning andrange of equivalency of the claims are to be embraced within theirscope.

1. A method of improving data link performance between two or morewireless data transceivers comprising: combining two or more waveformsto produce a composite waveform; creating a first time series of thecomposite waveform in parallel to a second time series of the compositewaveform; calculating data components of the second time series whichwill cause non-linear saturation effects when amplified by a downstreampower amplifier; clipping and inverting the data components of thesecond time series which are calculated to cause non-linear saturationeffects in the downstream power amplifier; delaying the first timeseries to align the first time series with the clipped and inverted datacomponents of the second time series; adding the clipped and inverteddata components of the second time series to the delayed first timeseries to obtain a modified composite waveform; creating a sacrificialband containing principal energy of the clipped and inverted datacomponents of the second time series; harvesting the principal energy ofthe sacrificial band to obtain an optimized composite waveform; whereinat least one of the two or more waveforms are intentionally configuredto cause the composite waveform to produce non-linear distortion tooptimize the harvesting of the principal energy; and amplifying theoptimized composite waveform with the downstream power amplifier of oneor more of the two or more wireless data transceivers.
 2. The method ofclaim 1, wherein at least one of the two or more waveforms includesencrypted data.
 3. The method of claim 2, wherein the encrypted data isat least partially formed by a randomized process.
 4. The method ofclaim 1, wherein all of the two or more waveforms include identical datain different channels within the composite waveform.
 5. The method ofclaim 1 further comprising: delaying the modified combined waveformbefore the step of combining the sacrificial band to the modifiedcomposite waveform in non-overlapping signal space.
 6. The method ofclaim 1, wherein the step of adding the clipped and inverted datacomponents of the second time series to the delayed first time series toobtain a modified composite waveform, modifies the composite waveformwithout knowing or changing any data contained within the two or morewaveforms.
 7. The method of claim 3, wherein the step of adding theclipped and inverted data components of the second time series to thedelayed first time series to obtain a modified composite waveform,modifies the composite waveform without knowing or changing anyencrypted data contained within the two or more waveforms.
 8. The methodof claim 1, wherein each of the two or more waveforms of the optimizedcomposite waveform are equally amplified by the downstream poweramplifier as a result of the optimized composite waveform.
 9. The methodof claim 1, wherein the harvested principal energy is reused.
 10. Acommunication device that improves data link performance between two ormore wireless data transceivers comprising: a. one or more parallelprocessing blocks including non-transitory firmware configured to: i.combine two or more waveforms to produce a composite waveform, ii.create a first time series of the composite waveform in parallel to asecond time series of the composite waveform; iii. calculate datacomponents of the second time series which will cause non-linearsaturation effects when amplified by a downstream power amplifier; iv.clip and invert the data components of the second time series which arecalculated to cause non-linear saturation effects; v. delay the firsttime series to align the first time series with the clipped and inverteddata components of the second time series; vi. combine the clipped andinverted data components of the second time series to the delayed firsttime series to obtain a modified composite waveform; vii. create asacrificial band containing principal energy of the clipped and inverteddata components of the second time series; viii. harvest the principalenergy of the sacrificial band to obtain an optimized compositewaveform; wherein at least one of the two or more waveforms areintentionally configured to cause the composite waveform to producenon-linear distortion to optimize the harvest of the principal energy;and b. the downstream power amplifier of one or more of the two or morewireless data transceivers amplifying the optimized composite waveform.11. The communication device of claim 11, wherein at least one of thetwo or more waveforms includes encrypted data.
 12. The communicationdevice of claim 12, wherein the encrypted data is at least partiallyformed by a randomized process.
 13. The communication device of claim11, wherein all of the two or more waveforms include identical data indifferent channels within the composite waveform.
 14. The communicationdevice of claim 11 further comprising: delaying the modified combinedwaveform before the step of combining the sacrificial band to themodified composite waveform in non-overlapping signal space.
 15. Thecommunication device of claim 11, wherein the step of combining theclipped and inverted data components of the second time series to thedelayed first time series to obtain a modified composite waveform,modifies the composite waveform without knowing or changing any datacontained within the two or more waveforms.
 16. The communication deviceof claim 13, wherein the step of combining the clipped and inverted datacomponents of the second time series to the delayed first time series toobtain a modified composite waveform, modifies the composite waveformwithout knowing or changing any encrypted data contained within the twoor more waveforms.
 17. The communication device of claim 11, whereineach of the two or more waveform is of the optimized composite waveformare equally amplified by the downstream power amplifier as a result ofthe optimized composite waveform.
 18. The communication device of claim11, wherein the harvested principal energy is reused.